21003402 has 32 divisors (see below), whose sum is σ = 48241152. Its totient is φ = 5971824.

The previous prime is 21003397. The next prime is 21003413. The reversal of 21003402 is 20430012.

It is a super-2 number, since 2×21003402² = 882285791147208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8433 + ... + 10635.

It is an arithmetic number, because the mean of its divisors is an integer number (1507536).

Almost surely, 2^21003402 is an apocalyptic number.

21003402 is an abundant number, since it is smaller than the sum of its proper divisors (27237750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21003402 is a wasteful number, since it uses less digits than its factorization.

21003402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21003402 is about 4582.9468685552. The cubic root of 21003402 is about 275.9073150242.

Adding to 21003402 its reverse (20430012), we get a palindrome (41433414).

The spelling of 21003402 in words is "twenty-one million, three thousand, four hundred two".